{"product_id":"black-obsidian-polished-freeform-1-855-kg-collector-specimen-volcanic-glass-display-piece","title":"Black Obsidian Polished Nodule 1.85 kg — Collector Specimen Volcanic Glass Display Piece Cabinet Size","description":"\u003cp\u003eThis substantial black obsidian nodule weighs 1.85 kg (approximately 1.8 lbs) and presents mirror-quality polish across a complex, lobed surface morphology. Deep black volcanic glass is interrupted by striking golden-brown translucent flow-banding zones that catch light from within, revealing the stone's true character as a geological record of rapid magma cooling.\u003c\/p\u003e\u003cp\u003eObsidian forms when silica-rich lava solidifies so quickly that no crystalline structure develops — the result is a naturally amorphous volcanic glass. The conchoidal fracture surfaces visible on this specimen are the same feature that made obsidian a prized tool-making material for thousands of years. Locality evidence points to Mexico or Central America, regions historically associated with high-quality black obsidian with pronounced banding.\u003c\/p\u003e\u003cp\u003eAt cabinet size and high-grade display quality, this nodule is suited for a mineral collection, a natural history shelf, or as reference material for a working lapidary studio. The contrast between jet-black body color and amber translucent zones is exceptional for a specimen graded common — the size and surface complexity elevate it well above typical obsidian on the market.\u003c\/p\u003e\u003cp\u003eWeight: 1.85 kg (4.08 lbs). One specimen available. Sold as shown.\u003c\/p\u003e","brand":"garland_workshop","offers":[{"title":"Default Title","offer_id":56279978672420,"sku":"GWL-00260","price":72.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0867\/4875\/8308\/files\/GWL-00260_01.png?v=1789329375","url":"https:\/\/zebraindustries.net\/products\/black-obsidian-polished-freeform-1-855-kg-collector-specimen-volcanic-glass-display-piece","provider":"Zebra \u0026 Co.","version":"1.0","type":"link"}